“There were no warnings,” lawyers for Mets owner Fred Wilpon, his son Jeff, team president Saul Katz and others said in a filing in U.S. District Court in Manhattan. They said the Mets owners and their families and friends were betrayed by a friend and realized a loss of more than a half billion dollars when the epic Ponzi scheme was revealed in December 2008.

The papers were filed in response to a lawsuit brought by court-appointed trustee Irving Picard, who has filed more than 1,000 lawsuits seeking to recover billions of dollars lost by investors in Madoff’s fraud. Picard has argued that investors such as the owners of the Mets owe as much as $1 billion to other investors because they withdrew enough money that they came out hundreds of thousands of dollars ahead of their original investment.

Picard’s lawsuit against Mets executives “is a fiction,” the lawyers said. They noted that no other investor was able to spot the fraud early either and they insisted that they had no idea that Madoff was not investing their money as he said he was.

According to the court papers, the Mets executives used Madoff accounts in much the same manner as they might have used traditional bank accounts, depositing excess cash for short-term investment before withdrawing it for use in operating their businesses. The lawyers said the Mets would deposit cash received from Mets season ticket sales during the winter with Madoff to maximize returns until the funds were needed a few months later to meet expenses.

Madoff, 73, is serving a 150-year sentence after admitting in 2009 that his private investment business was a fraud since at least the early 1990s. Picard has alleged that the fraud lasted at least 25 years. Investigators say about $20 billion was originally invested with Madoff, who told the investors that their money had grown in value to about $68 billion. In fact, there was only a few hundred thousand dollars remaining when the fraud was discovered.

The Mets executives said through their lawyers that they should never have been targeted by Picard. A message left with Picard’s office for comment Thursday was not immediately returned.

The lawyers said Wilpon and Katz invested with Madoff after Wilpon met him through their children years after the Brooklyn brothers-in-law started a small real estate company called Sterling Equities 40 years ago. Their brothers, Richard Wilpon and Michael Katz, soon joined the company. Eventually, the company expanded, buying the Mets baseball team and various media.

According to the court papers, the Wilpons saw the Madoffs at charitable events, family celebrations and “maybe two or three times in all those years (they) went to a movie together.”

The lawyers said Saul Katz had a business relationship with Madoff and could not recall a single time that he went out to dinner with him.

They said the Sterling defendants’ faith in Madoff continued until his fraud was revealed, with millions of dollars being deposited in the weeks before the announcement and one investment even occurring on the day of his arrest.

“It is testimony to the fact that the Sterling defendants were completely in the dark about Madoff’s fraud,” the lawyers wrote.

They noted that Fred Wilpon had called Madoff’s confession “like a dagger in the heart.”

The lawyers challenged Picard’s claims that the Mets executives and others they knew made a massive profit of $300 million from “other people’s money” during a quarter of a century of investing with Madoff.

“Contrary to the extreme and damaging allegations in this complaint, the overall return on the Sterling defendants’ investments was hardly “staggering,” particularly over a 25-year period. Had the defendants invested their funds with Berkshire Hathaway, for example, their return on income would have been vastly greater,” the court papers said.

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